class_docstr: test GridspecLayout
docstr: test retrieving widgets with slices
docstr_tok: ["test","retrieving","widgets","with","slices"]
code: def test_getitem_slices(self):
      "test retrieving widgets with slices"
  
      box = widgets.GridspecLayout(2, 3)
      button1 = widgets.Button()
  
      box[:2, 0] = button1
      assert box[:2, 0] is button1
  
      box = widgets.GridspecLayout(2, 3)
      button1 = widgets.Button()
      button2 = widgets.Button()
  
      box[0, 0] = button1
      box[1, 0] = button2
      assert box[0, 0] is button1
      assert box[1, 0] is button2
  
      with pytest.raises(TypeError, match="The slice spans"):
          button = box[:2, 0]
  
imports: from unittest import TestCase
  from unittest import mock
  import pytest
  import traitlets
  import ipywidgets
  from ipywidgets.widgets.widget_templates import LayoutProperties
label_desc: Use image node_id 5 for calling the TestGridspecLayout obj's underlying member method code with example usage: obj.test_getitem_slices() without return types